Sooooooooo true!
Heroes without Hiro with powers... I can't even imagine it!

To be honset, there's seriously NO WAY that Hiro wouldn't get his powers back!
But now that Arthur Petrelli is dead, I can't see how he could get them back...

My theory - or rather, what i hope to happen now that Hiro is stuck in the past - is this:
Hiro would spent time with his father in the past, helping him to get over his mother's death.
Then there would come that "moment", when Hiro realizes something or something like that, and then he would get his powers back! And he's father would see it and he would be proud
