As someone mentioned earlier, we could see an invasion of corporate sponsored coins such as "JPMorgancoin" or "Verizoncoin". While the first reaction is obviously to stay far away, they will undoubtedly provide benefits to people who happen to already be using those services.
I'm the one who mentioned "JPMorgancoin" or suchlike - and got swatted by our resident sooper-genyus, after which I swatted back - but now that someone serious has taken up the topic, I'd like to present two alternate scenarios. First the bad one:
Worst Case: "JPMorgancoin", "Verizoncoin", "McDonald'sCoin" et. al. blow us all away because they're much slicker than the best that all of us can come up with. This is the "Amateur Hour Is Over" scenario, in which ordinary folks decide that the entire crypto-space as it is now, is just too polluted to be bothered with. They trade up to "legitimate" cryptocoins right from the start and we're left behind for the history books that'll be written when we're much older and scattered to the hills.
Best Case: "JPMorgancoin" et. all. legitimizes the entire cryptocurrency scene, including us. We all have new prestige as bona-fide early adopters, and our newfound prestige carries over to our favourite coins. Clever evangelists take the opportunity to debunk the FUD surrounding Bitcoin, et. al., by using this two-pronged technique: the FUD either wasn't true at all, or else it was true but is true no more now that the entire industry is legitimized by the biggies coming in.
If they're astute, they will miss no opportunity to show how the "legitimate" alcoins are to the "illegitimate" ones. (Almost certainly, I'll be one of the "they.") Many of our faves won't survive the rush to legitimacy, but it's a sure bet that
we as people all will make out like bandits. For example, just think of how hot your resume will become once "JPMorgancoin", "Verizoncoin", "McDonald'sCoin" et. al. become big hiring centres...
As you might have guessed, my own inclinations lean towards the best-case scenario.
But I think my instincts are sound in re my tilt, because early adopters in general do have a prestige - including a real resume prestige for a tech subsector that suddenly becomes hot. When Ruby on Rails became a go-to-platform, early adopters could pretty much write their own ticket when the recruiters came calling...
That said, I fell obliged to present a third scenario. I think it's less likely than either of the two, or a mix of them, but I might as well finish with it:
Curve-Ball Case: Cryptocurrency never takes off and just fades into the sunset. This one seems very unlikely because of the venture capital moving into the Bitcoin space, but it's still possible. VCs have been wrong before.