One of the big box stores announced a couple of months ago they will not stock incadescents next year. The big 3 bulb makers control most of the market. I do think the proposed legislation is dumb because the availability of regular bulbs will no longer be there. I’m sure you’ll always be able to get them on-line.
The stores will sell them as long as their is a demand for them.
Otherwise someone else will get the business.