I'm just as annoyed with the hurdles to buying real pseudoephedrine as anyone else, but let's not make the production of bathtub meth any easier. It is not worth it.
Even more if the professional labs close down due to lack of customers.
The professional labs would absolutely not close down due to lack of customers, there would just be even more meth available, more contaminated, with the bonus of hazmat sites peppering communities.
There might be an increase in people making tiny batches for personal use if pseudoephedrine became easier to get, but nothing on the scale of 20 years ago.