Well, considering LTC will soon gain much more attention than it already has, its market size wont be so small, so , not a very good argument there...
I will agree with you on this, if it doesn't crash hard after being added to Gox. But the chance it does is fairly high.
Bitcoin is fairly protected against a 51% attack by massive network power, too. So the advantage is insignificant.
(And I would argue, if Litecoin were as successful as Bitcoin we would have Litecoin Asics right now)
What else does Litecoin offer? faster confirmation time, that does come at a cost, too.