With a bit of luck and dedication I think current times are good to get your tank into raiding.
As a tank you'll have to go the long road though: heroics, nax10, nax25 and only then begin thinking about Ulduar.
Luckily on my server at least, Nax 10 and 25 are pugged on a very very regular basis. Also the tanks of the raiding guilds doing Ulduar won't do Nax anymore because being fed up with it and those PuG raids are often filled with alts of said raiders.
But.......it's gona cost you.......it's time to get the cash out and get all the crafted epics (and blues if needed, the crafted epics from runed orbs might be too expensive), get enchanted to the teeth and get everything from heroics you can (tier tokens last if you even need them and also make sure you wear the right tabard so you can get the headenchant) and dive into raiding. The pvp stamina shoulder enchant is very good, so even without hodir rep you should get them enchanted.
I'd advise to primarily focus on heavily stacking stamina while being critimmune because healers these days won't go oom. Good starters are obsidian sanctum and then Nax. (I would have said VoA previously but Emalan can be a bit hard.)
Good luck..............but be prepared to run into the Horribad PuGs once in a while. Don't let it get your spirit down though.