"Scam" doesn't really seem relevant here.  Ethereum talked about what they planned on trying to deliver over a year and a half ago in these forums and did exactly that.  They came out with prototypes long before release.  If they'd run off with all presale money without delivering then "scam" might be appropriate but when someone does exactly what they say they are going to try to do you can't classify it as a scam - doesn't really fit the dictionary definition.  Words mean stuff ... save scam for when it applies (and FUD too for that matter).

As to the scaling - ethereum has a roadmap that should lead it into feasable scaling with casper.  At Bitcoin's current trajectory even quadrupling the transaction load would be death.  At least ethereum acknowledges it as a problem and is taking proactive steps.  Not some hellish wallet hack that should be done thru a hardfork WITH a blocksize increase.

FWIW I feel as uneasy with my money in ethereum as bitcoin.  But his big picture view of what could happen with a price increase -> volume increase -> clogged transaction -> halving -> price drop -> further hash drop -> further price decrease reflects what I've been thinking for the last few months.  I give it some probability of happening and I see it discussed very little.