The thing to keep in mind when speculating about the Fairy type's strength and weaknesses is that, as it was announced, the Fairy type is meant to balance out the imbalances of the game. Because of that, there are type weaknesses and advantages that it will not likely have. For example, I don't believe it will be weak against Fighting or Ground type attacks, since both of those attack types are tied for having the advantages over the most other types, with five each. We need to logic this out.
I could see Glalie becoming an Ice/Fairy type....with Snorunt staying pure ice. That way Glalie would have a dual typing just like Froslass. It fits too, wasn't Snorunt based on some sort of eskimo fairy tale?
It's a bit like with Gardevoir having two types now and not just Gallade. On that note I imagine Ralts and Kirlia will remain pure psychic since it would be weird if they went from fairy to fighting.
If Fairy is weak against poison, than many monkeys will be pleased because they can shoot their gunk using gunk shot.
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I think the fact that Ash's Pikachu will never evolve is all the more reason to make a change in this way. Its a smaller way of refreshing Pikachu by adding to it without taking anything away. It would gain a new type, giving it new advantages and disadvantages and would open up new opportunities for moves. I think it would make the anime Pikachu, and indeed the species as a whole, much less stale.
I would have no issue with other Pokemon becoming Fairy-types where it makes sense to do so, regardless of those Pokemon being legendary or dual-typed. Togekiss is a prime example.
In fact, I hope that in many years time, improvements will be made to older Pokemon in a retcon-style reboot of the franchise. Older Pokemon could change their types, learn different older moves they had no access to before, TM's could be improved, so that they only taught decent moves, extra formes could be added to older Pokemon, who came out before formes existed. Like with Mewtwo in this generation. Gyarados and Charizard could swap their flying type for a dragon typing. Weak Pokemon that are overlooked could have their stats improved and be given evolutions en masse,(a'la Sinnoh) rather a handful every 4-8 years.
Pokemon like Luvdisc and Alomamola could retrospectively be discovered to be related (a'la hitmonchan and hitmonlee). Also, incense could be done away with and baby Pokemon just automatically hatch out of eggs, regardless of which generation they were introduced in!
Improving on old work isn't a bad thing, as people seem to make out, subject to these things actually improving older creations!
Oak's Lab: x30
Advice to the writers for the 6th Gen:
1. Give a fair distribution of screentime and battles- No Pika-Hogging.
2. Give Ash as many Pokemon as you will bother with, and no more.
3. Evolution is nothing to be scared of. Especially evolve Starters, please!
Luvdisc and Alomamola should be related for obvious reasons, and I think that luvdisc might get fairy type, possibly.
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Whatever other fairy Pokemon GameFreak adds, I hope goblins, trolls, manticores, gryphons, and any other intimidating mythical creatures are added into the mix. It gets a little annoying when people, who are only familiar with Tinkerbell-esque fairies, assume and state that adding a so-called "girly" type was a mistake and anything that isn't small and cutesy is not a fairy. And so what if fairy Pokemon all end up being feminine and cute? We have had those types of monsters in every single generation, so why wait till now to start complaining? Are people that insecure with their masculinity that they believe fairies are a problem?
Also, this will hopefully stop the "it should have been called light or cosmic type" arguments. In fairy tales, fairies have the power to destroy dragons. And that is what GF was going for when they were creating the new type. I mean, how would light or cosmic being effective against dragon Pokemon make any sense?
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I speculate as to seeing something similar, with types becoming less effective/more effective to each other.
~~ Pokémon X and Y , the new generation...~~
On the hunt for my first X&Y shiny! (and my first RE maybe.. >.<)
Y Team: Delphox, Blastoise, Sylveon, Aurorus, Dragalge, Yveltal
X Team: Greninja, Charmeleon, Pikachu, Eevee (Espeon/Leafeon)
[Thanks to Equal-to-Heaven for the Yveltal clock!]