It is doable but you will be cutting it fine.
To do this you would depend on several factors:
1) That you know exactly where you are going from the TGV station to your terminal. You will not have time to stop for anything.
2) That you are already checked in online.
3) You are carrying hand luggage only. If you have any checked luggage forget it.
4) You are travelling with only adults, or at least older fast moving kids - small children will slow you down - don't just decide to leave them behind!!
5) You are pretty fit and not averse to charging through an airport, especially if your train is a few minutes late.
If you don't fulfil any of these then get an earlier train, bus or shared transport. If you would simply like a more relaxing last day leave earlier - I've missed a plane before and it is not a great feeling, neither is forking out for another fare home!
It is not essential that you squeeze every possible minute out of your trip just make sure that you enjoy it while you're there. We were faced with a similar problem for returning this year we decided to get shared transport back and I feel so much more relaxed about it now.
Either way once you book it you know what to expect on the last morning!