What will be collected?
The toys and their packaging hold the strings to the heart, so can't see them becoming unpopular anytime soon.
Bonsai_Tree_Ent said:
In terms of new 'hot' areas within the hobby, I'd have to say posters. I'm biased here because I've moved into Star Wars poster collecting myself a while back, but they are awesome, they are vintage, they have the wow factor, and most of them are still attainable on a relatively modest budget.
I think that the poster point could be very valid. The don't carry the potential stigma of being a toy collector from those outside of the community. They are also incredibly cool and to add icing to the cake they are of course a much easier sell to wives and girlfriends to put up either around the house or in an office/den.
What platform will the community be on in 5 years time?
I'm not too sure it will be on a single dominant media platform at all; I'd be surprised if the whole community doesn't become very dissipated before maybe coming back together again. I think this will be for a few reasons; there appears to be very different collecting styles coming out (flash harry's with a load of money, old timers, purists, completists, flippers of course), I think therefore different platforms will separate these sub communities out over time and people do tend to huddle together with those they like. You can already see this with some of the FB groups, some are very insular and only seem to like their own members, newbies are not easily invited in... some might say that happens here too if they're not careful with their own introduction of course.
I'm already seeing that outside of Star Wars, my social media world is changing, twitter is dying if not already almost dead, huge swathes of friends and businesses (let alone celerities) are switching over to Instagram, my kids don't use or want to use Facebook, they're both on IG. My brother's business' main social media exposure is through IG too. There are actually a rather large Star Wars selling community already underway on there, specifically the US (of course) and in a bigger way Japan and Asia generally, its difficult though as its basically unpoliced sellers, lots of gear, some bargains of course some very dodgy sellers too...
All of that aside a forum format or wikipedia style site will always be required to slake the thirst for knowledge, but regular updates to format and ease of search will be key to staying at the top of the pile in this style of information sharing. The customers/users will always be old guys, but they'll also always want the new and better/best to go with the vintage; it adds credibility and of course easier to use more users.
Prices...
I do think they'll continue in some circles to escalate and in more solid communities where the rises are not so tolerated (like here) be kept as low as possible in the face of the rises. Not sure when the drop will come, but I'm certain it will in some way, even if a small one, as has been said the Disney steam train can't roll on forever and the spotlight will move on in some way in about 5 years time. I believe strongly that the famously expensive stuff/figures/MOCs will maintain the premium and the more common Klaatu's will forever be the ugly hooker that stays cheaper than the rest.