From my point of view it is hard to say if rF2 will be dropped or not - I would say no. Why should it be? At the moment they are selling the Q-packs , stuff like the BTCC cars, single tracks etc. pp.
I think it should have named rF3 or rF2-2020 or so, but if it comes to licenses of cars, manufacturers, tracks etc. they could be bound to the product and its name ... so sticking with the name rF2 seems to be easiest.
I do not remember exactly, but Project Cars has taken 3 or 4 years in development, PC2 a little bit faster? And there are still bugs in PC2 (and PC) which will never be fixed I think.
There is a lot going on in rF2 nowadays. And only a few things which have been introduced the last 12 months have been finished and are implemented fully.
That shows that rF2 is still being developed.
And as mentioned above they are still hiring people.
If it is wanted or not - I do not know and I doubt it - but negative publicity is also publicity; if it comes to music bands it seems quite normal to announce the split, a very last concert on a regular basis ;-)
As we do not have a big chance to influence it - as mentioned before - we could show that rF2 is still wanted by playing it, buying content, releasing (community) content and to support the devs in a way making detailed and thorough bug reports.
And yes, sometimes it may be nearly impossible to fix a bug because of the code which would need to be rewritten for a great part which is not practical mostly.