Max accounts in bitcoin wallet / max wallet size

[winnetou]

Hi,

I like the idea of accounts in the wallet although some people dont like it.

Some questions

1) Will accounts be supported long-term?
2) Is there a maximum of accounts a wallet can handle?
3) Is there a possibility of deleting accounts? I would like that.
4) Can it be a problem if the wallet expands to unusal filesize > 100mb, >500mb because of the high number of addresses / accounts ? How do big services like Mtgox handle this?

Thanks

Cheers

winnetou