Both RTD and Tennant probably would like a rest. And the BBC really don't want to lose either of them. I still suspect the three specials will be RTD's swan-song... a transition period between his tenure and whoever comes next. It probably gives whoever is in charge of Series Five more time to prepare.
The future of Tennant is less clear. After a year off with only three specials, he might welcome doing another season. And if by then he decides to leave, I expect he'd be back for the start of that series - so that the new writer can kick start the next regeneration...
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The future of Tennant is less clear. After a year off with only three specials, he might welcome doing another season. And if by then he decides to leave, I expect he'd be back for the start of that series - so that the new writer can kick start the next regeneration...