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I changed my 5 ETH by LTC yesterday ...

It will. It's strong blockchain will keep it alive and eventually take off again.

i don't see why not, everyone loves it. i never trusted it because there is no coin cap

I got few ethereum, shld I hold on or sell it.

I have a few shares too ... holding.

True no cap, but it gets used up to run apps, so a continuing supply will be needed. I think most of this is just the ICO stuff, which you have to buy into with ETH, I believe.