Firms are always going bust. New more suited ones push them out. Jobs come and go. It's remainer propaganda to be suggesting it's doom and pushing it at forums.
In addition we all know Brexit has nothing to do with xenophobia, bigotry nor dogma. It has everything to do with getting out from the EU yoke. Such accusations are totally unworthy and those who make them owe all decent folk an apology.
Meanwhile it may be than none of us are here in 50 years time, but if so, and genuine Brexit has occured, we'll still shuffle off this mortal coil knowing we achieved the best for all future generations of the UK, despite opposition from those who wished us all to remain obeying the Commission's diktats.