I don't know about all the off-chain solutions for Bitcoin. I was mainly speaking to the 10 minute block time of the network. They won't speed it up, and someone isn't going to wait 10 minutes in line just to check out. That's mainly what I'm saying. You could still use it to hold large sums of money, but I don't think it would make sense for day to day transactions.

Just my $0.02 worth. Wait, the markets dropped. It's only my $0.01 worth. ;)