https://www.drehscheibe-online.de/foren/read.php?002,10678552Most likely less than what currently is the case unless they find another solution.
Splitting the München to Zürich EC is also under discussion but I doubt they do that.
To save you reading all 176+ comments: both SBB and DB have denied this; among measures will be making the trains set down/pick up only at St Gallen, with extra ICs to keep the half-hourly Takt service from Zürich.