Today's theories are constrained by so much observational data that an idea sounding "solid" or plausible at first glance just isn't enough. There are many plausible ideas that have been and are being tried all the time. The proof is in the pudding, however, which is the math. You have to show that the physical model actually predicts what we observe in quantitative terms, and is in better accordance with the observational data than the existing established theories. If you can do that, great. Otherwise, mere ideas don't yet amount to much.