They should be good. What have you got to lose? only space. Give them the right conditions next year, and watch them grow.

I had one last year(Peaches and Cream) that did not flower for various reasons. I saved it and it flowered this year. Not an indicator that the plant is bad, maybe an indicator that it is a very slow variety. Slow varieties don't last too long with me.

This year I have at least ten that didn't bloom. Too hot, too dry, poor soil, maybe the dahlia fairies were against it. I'll change their growing conditions and see what happens next year. After that second chance, they're outta here.