As long as paladin remains in their current state.. they will be able to continue tanking raids at a high level.. I wouldn't be worried at all about being out shined by a warrior.

Honestly while warriors are getting buffed.. I still don't believe they will match what a paladin brings to the table.

Like other people have said, SE is probably just attempting to get diversity in raid groups by having ppl bringing more then just Pld/Pld for tanks