If we had left at the end of March, as we should have done, things would have been more settled by now so you only have (mostly) Remainer MPs and rubbish Remain supporting negotiators to thank for this extended period of uncertainty. Actually, we could have left in 2016; there was no need for a lengthy negotiation period which Theresa totally wasted anyway. The ERG and other Brexiteer MPs couldn't vote for her deal which would have kept us under EU law indefinitely. That is NOT BREXIT.
Some business may suffer, I agree, others will flourish, just as they have done over the last 40+ years while we have been in the EU (originally, the ECC). I can't think of one single occasion though where the EU has actually helped any of our business to survive but I could give numerous examples of where the EU had given grants ( paid for with our own bloody money) to companies to up sticks and move out of this country, some even to benefit non EU countries like Turkey!