As for the idea that ltc is safer than btc, due to the risk of a dump -- I'd argue that if btc crashes due to Satoshi dumping, that he takes everyone with him. That means ltc, alts, crypto in general. If btc dies, ltc and friends go too. Consumer confidence in cryptos would be gone forever.
I'm not sure I buy that argument. Bitcoin has had many crossroads where consumer confidence was shaken in it and it recovered because people were made aware that it was not a weakness in the protocol or software, but something external. It might be crippling to Bitcoin to have Satoshi knock the price into the dirt by selling off his hoard, but I don't think it means the end of digital currency...it's a technology whose time has come. Just because the stock market has suffered numerous crashes and people have lost a lot of money in it, that hasn't stopped the stock market from continuing to march forward.
I just think anyone who is in crypto in a serious way needs to really look at the fact that Satoshi HAS such a hoard...and to me, Litecoin is the alternative.
As for multi-coin payment processors...the number of coins they accept will be limited by liquidity and almost no other cryptos have sufficient liquidity to support significant commerce.