I would suggest - four years on from the slightly frivolous comment - that you have two forces. Yes, you still have an element of reduction from 5 days in the office though far less now, and you also have the success of the Elizabeth line in brining so much more economic and travel positives to the Thames Valley, as discussed in other threads.
I - risk - speculating again. Extend the Maidenhead Crossrail terminators to Henley perhaps - goodness knows what that would do with the parking.
:12 and :42 from Maidenhead
:22 and :52 at Twyford
:34 and :04 at Henley
:39 and :09 at Henley
:51 and :21 at Twyford
:00 and :30 into Maidenhead
Cuts down the layover times and turn back times - I think that replaces the diesel train on the branch with an electric train but no extra diagrams? Couple of minutes of slack in there too. It does mean 4 trains an hour over what is now an occasional foot crossing to the car park at Twyford, but then in makes Shiplake and Wargrave

into potential car parking targets with half hourly though trains to central London.
Up the service to Maidenhead from London from 4 to 6 per hour and you could extend the other two services similarly to Bourne End / for Marlow - re-engineer Bourne End in a New Holland sort of way?