there is a big chance that it will still trigger RA, am i right? if so will pilots follow RA knowing there will be 1000ft separation?
I would say it's likely to trigger a TA, but in my experience unlikely to generate an RA, if circumstances are as you suggest. If ATC have passed traffic to the pilot of the a/c climbing to FL310, then hopefully s/he will reduce the rate of climb until level (which s/he should be doing in the last 1000ft anyway).
On the rare occasions when an RA is triggered, then hopefully the pilot WILL follow it. The whole system is dependent on the pilot taking action if an RA is triggered. What if the a/c at FL320 suddenly starts to descend (who knows why) and the frequency is blocked?
Sure, if circumstances are as you suggest, then any RA is likely to be a nuisance alert. But pilots must always follow an RA. It's when pilots fail to follow the TCAS that real incidents occur.
LTP