Maybe as you say if you avoid watering the rolls as much as possible they might last a bit longer, and if you can keep them going maybe you could plant them into a bed, albeit a bit later, when something has finished.
I said on another thread about a path I intensely planted many years ago (with success). That came about because I had an allotment in London that I had to give up halfway into the season. So I transplanted all my veg off the allotment into this path we dug up. We even put three rows of bricks, just stacked up, underneath my greenhouse workbench. Filled it full of earth and I transplanted all my baby carrots back in there.
Our next door neighbor "Stan" was like a Harry Enfield character. The one that used to say "If I was being you I wouldn't do that". He said "you can't do that they will die". And yeah we did lose a few, but 80% not only survived but did really well. Even the carrots in the greenhouse, because they didn't have to force their way through the earth, were great.
So the moral of the story is nothing ventured, nothing gained.
Dear old Stan, in the end his interfering drove me so mad, when we built our sons a wooden fort he came out to tell us "you can't build that there", we told him it was going to be a chicken coop...he nearly laid an egg!!!!
Jill..
. and my peas might have done better. I'll definitely try it for parsnips and leek next time round, might even get some going now. Thanks for the tip!