I think the TX is going to sell very well. This is just my opinion, but I feel like the Lexus lineup is split into two categories. There’s the premium luxury Lexus vehicles that do compete with BMW/Mercedes/Audi then there’s the sort of entry level Lexus luxury vehicles that compete more with Acura/Infinity/Genesis. I feel like the LS, LX, LC, RC, and GX are in the premium Lexus lineup, with the UX, NX, ES, and TX are in the entry level Lexus category. The IS and RX fall in the middle, depending on trim.
I doubt there will be a whole lot of would be BMW or Mercedes buyers cross shopping the TX, but I do think the TX will sell very well to people who are moving up or want something nicer that a Highlander. I think the TX is a great bridge to introduce people to the Lexus brand.