Not sure about problems with maintenance of the roof with solar panels?
We have had 52 panels on the roof since 2011. Pumped over 65Mwh since install. Way more than our consumption over that period. Zero issues. The panels actually protect the roof, and if you need to get to the roof under the panels (unlikely) they are easily removable.
It's still a lot cheaper to stay connected to the power once you add up the cost of roof maintenance of the existing roof and the replacement of panels.
Roof maintenance would be independent of solar panels. If it needs maintenance it is unlikely to be due to the solar panels. On a tile roof, maybe the ridge capping might need a spruce up every 15 years or so. As for the panels themselves, they're good for 20 years or more (ours have a 25 year/80% output warranty). With improvements in tech, it's possible they will be replaced sooner to substantially increase output.
As for cheaper, no. We are financially well ahead already, and the cost of the panels has been paid back by credits from the electricity utilities. Going completely off-grid is a lot more expensive, but will still pay back over a longer time span.
Waiting for 'good turbines' ?
Sounds like delay tactics. Best thing to do is to install as soon as feasible, not wait for the next big thing as there will always be something even better on the horizon.