There are always new people joining everyday.
I don't think you'll have any trouble getting a party.

This game could last as long as you want it to .... there is always something to do.

Missions in every nation. Quests. Side quests (ie for your sub job or advanced jobs, or getting chocobo license etc). Raise your own chocobo. Leveling up your characters jobs. Join a guild and skill up your synthing. Join a LinkShell. Make friends. Farm mobs for items. Sell items on Auction House. Fish. Garden. or just explore the different areas (its a really big place).

I can't think anymore

but yea, there is sooo much that you can do, if you finish everything in a year or two, i will create an internet site dedicated to you
I bought this game earlier this year (like feb/march)and i am still working on intro game stuff ... mostly leveling so i can do story line missions ... and i need (1 more) rank to get 6 and do CoP and Zm's ...

P.S.
Come to Garuda Server ... nobody here is on that server but me ... and i think its the best one