Business ideas are like freshly buttered warm toast, they look wonderful. But if put to one side for long enough they get cold, stale and uninviting.
The first surge of excitement at discovering an opportunity needs to then have action to build a momentum, which in turn drives further action.
If the initial process of research and getting products or services to market takes too long, it may never happen.
There is the real chance also that if the idea is topical and takes advantage of events or trends that are happening right now, others will go ahead and do it while you are dithering.
If you have a good business idea, check out that it is commercially viable and do it. Right now.