Really? You can prove the recent rise in altcoins is attributable to us not converting to mBTC? Got any evidence? Ever thought there may be other reasons. Diversifying risk? Supremely skilled pump and dump artists?
What does converting to mBTC have to do with anything? People aren't that stupid not to understand that 110 mBTC is still = 0.11 BTC, it's not a whole BTC
They want to own a whole BTC, but many only got a hundred bucks to spend. So what do they do? Go for an alt-coin, you still can buy 3
full litecoins for example with that money, and feel good about yourself that you own something as a whole. That's one of the reasons.
Diversifying risk too of course, but that's when you're already into bitcoins. For newcomers they'd first consider bitcoins as it's the first one they hear about. And when bitcoin becomes absolutely unaffordable for most (somewhere past $5k), that's when alt-coins really take off, although they've already been taking off in the past 1-2 months relative to bitcoin.
Pump and dump is not unique to alt-coins, it happens in bitcoin too, just with less volatility, since it takes more efforts to move the bitcoin price.