Do you think the UK PM should be limited to 2 terms in Office.?

The reason I ask this is that after a while I believe all/most leaders lose touch with their electorate and the real world. Blair has always courted the rich and famous and as we know there has been the odd allegation of corruption. Do you think it would be a good idea to take on the USA system where their President can only serve two terms in office. I don't mean follow the US system of elections just copy the maximum of two terms for the PM