TCU in the Mountain West was already a geographic clusterfuck. Air Force was probably its closest peer institution, and that's a 13-hour drive. In the case of SDSU, they were traveling two time zones to play away games. Now they're just switching over one time zone, and for the most part the distance aspect will be a wash. The whole "zOMG TCU TO THE BIG EAST MAKES NO SENSE GEOGRAPHICALLY" argument is irrelevant. If anything, it just got easier for them because now they'll be able to fly into Philly, DC, NYC, Pittsburgh, Louisville, Cincy, etc as opposed to Laramie, Albuquerque, and having to fly to Denver/Salt Lake and drive an extra hour or two. The only place that'll be relatively difficult/expensive to get to will be Morgantown.
Can't say travel is much worse than if they stayed in the MWC and had to fly to Fresno, Boise and Hawaii
Also, this. Boise isn't exactly somewhere you often get direct flights to, and there's a reason that football teams can get an extra home game granted by the NCAA for playing Hawaii. The travel and logistical costs of going there are enormous. This move actually makes much more geographic sense for TCU.