"Alternative" doesn't seem like quite the right word to me. "Complement" seems so much better. Enjoy each type of vehicle for what it is.
I love manual transmission vehicles and love different types of vehicles. Hence the 5BW, GR Corolla, GR 86 (my daughter's car), Bronco, various motorcycles. All different flavors, all with manual transmissions. All very good at what they do, all *very* enjoyable.
If my 5BW got taken away (stolen, wrecked, whatever), and there wasn't a replacement, I wouldn't feel the need to "replace" it necessarily. It's been great, I hope it continues to be great, but I don't need a car exactly like it forever. For example, I had a BMW for a while. I enjoyed it, but have no pressing desire to duplicate or repeat it (BMW has helped with this process, but still). I'd probably just go in a different direction for a while. I haven't bought a new motorcycle in quite some time, so that's the obvious next direction.