Indeed, it's not often I disagree with Nigel (in fact, it may be the first time), but there is a big difference between a no-step, one-shot way into the heart of the city and the alternatives (of course one can have a no-step, one-shot way into the city via taxi, but at a much higher price - which is amortized if you are two or more sharing the cost).
One can hope, as Balso mentioned, that the new alternative will drop close to entry/exit for Line 14 and that the escalators and elevators along the line are functioning.
I still miss the Cars Air France buses. I know they got stuck in traffic sometimes but boy it was nice to sit back and relax, let someone else worry about the traffic and make it relatively close to where I needed to be for a much lower price than a taxi. (Of course for me with my annual Navigo pass, the RER to the airport is free, so the cost of the bus was not insignificant in its own right, but still felt like a nice compromise.)