[Q] Clarification needed

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Sorry if i seem a bit slow but i still haven't quite got the hang of android yet after many years of windows mobile.
I have a Desire which i have debranded using a goldcard and i have just rooted my stock froyo using unrevoked but have not installed any custom roms on it.
My questions are as follows: As i am now with rooted stock rom, will any updates be offered to me ota or do i have to unroot first?
If the answer is yes to updates being offered, will i still need to insert my goldcard to install them?
Why have i had to use my goldcard to install ota updates as i have debranded. Is there not a permanant fix so that my phone is properly debranded?
Any help from the forum gurus would be greatly appreciated.
Thanks.

1. Yes you should still be offered updates, but accepting them will remove root access
2. Yes, the gold card will be need to be used for ALL future updates
3. There is no permanent fix at present

Thanks. Just what i needed to know.