I have been to Leica Shops in Harrods and Mayfair in London, they say it has received a lot more attention than any other Leica. So I think it will sell as good as Q2. I have seen some purist think the design has been "molested" because of screen design, I believe it will bring more customers than it repels. Personally , if I had a Q2, I would not upgrade but I am seriously thinking to get Q3. Nikon Z7ii £2.5K, Sony A7RIV is £3K, Canon R5 £3.5 K.. So a high res body costs £3K ish. and a lens similar to this will cost somewhere £500-1000. When you consider these, I dont think that it is expensive and on top of that resale value of Leica cameras much better than other brands, so initial extra money is paid back when you sell it.
But I hear people's fixed lens vs ICL argument. I think all- almost all people interested in this camera has already has an ILC camera and lenses, for me this is a good addition for my existing Panasonic G9. I am happy with my ILC camera system, I need something with more resolution, low light performance for streets and indoor, dark environment shots.
PS: Leica already reduced Q2 by 10%