Yes, I've heard that. Do they make doublets?
I do hope that there will come a time when triplets and quadruplets go the way of the Dodo. I would like to see affordable doublets exhibiting no aberrations whatsoever, even per an imager's requirements. It's been a long time since the achromat was developed, nigh 300 years; yes, our 60mm f/11 spyglasses are that ancient. Likewise, primaries of Newtonians with a figure, a curve, exotic enough to eliminate all aberrations associated therewith, and to enable 8" f/2 instruments with secondaries the size of a quarter, or smaller even; as well.
Yes, pipe-dreams, I know.
Yes, I already knew. Can't have bloated stars, et al.
If anything refractors will likely incorporate more elements like we've seen happen with camera lenses. More elements allows more ability to correct for more aberrations, and as AR coating gets better, it makes many element designs possible. I wouldn't be surprised if a seven element refractor came out one day that focuses ROYGBIV within fractions of a nanometer of each other and is free of all other aberrations... then triplets will be considered antiquated.