I am not a fan of any alts but recently tried ETH to make few micro transactions of 1$ with just around 1cent worth ETH on fees. I find this really helpful and i think i will do same for other micro transactions in future.
However i don't think people will move form bitcoin to other alts completely due to this block size issues because price of all other alts are really volatile and many don't want to take risk of holding large amount of alts in their wallets.
That's why I'm also fond of some of altcoins especially will mark Ethereum, Dash, Monero, Litecoin. There micro transactions fees one of the good side so there no reason why not experiment these coins. But still it's good behind the Bitcoin and surely in near no chance to lead . However, I'm satisfied to use these coins in trading, gambling.