That is little different to the timeframes between the UK putting Pakistan and India on the red list and then enforcing it. As and when reliable data comes out relating to firstly the transmissibility of the India variant, and second how well current vaccines respond to is you can't blame any country that hasn't already got it endemic in their populations from being cautious. International politics has no part in this, it's common sense.
Had the UK been a but quicker in closing down travel from the subcontinent then we may not be in this situation, however particularly with India itself, politics look as though they played a role, and the UK is paying the price for that political decision.
There is no point is tour operators and airlines putting on new services at present, and if the public had any sense they wouldn't be booking them just now. Be patient a few weeks and I believe that we'll all be in a better place, both knowledge and vaccination wise.