You realize we have amended the constitution many times right? Sometimes it's worked out well, other times not so.
No constitution is perfect. Ours certainly isn't. The founding fathers were not Gods. We have a decent, but far from perfect system. If the founding fathers could have peered into the future and seen where we are today, I am quite sure they'd have written some (perhaps many) things differently.
No, the founders were not perfect but I would wager than an honest accounting would reveal a ton of misery caused by NOT following the original constitution (and that includes all amendments after the first ten) for every ounce caused by FOLLOWING the original constitution. At this point the constitution is functionally almost completely moot, in many cases we only pretend to follow it with the original meaning being discarded in favor of some new version created out of whole cloth by liberal judges and in other cases it seems that we don’t even pretend to follow it as with the prohibition against anything other than silver and gold as currency. Does anyone REALLY believe that means that the states cannot do it but the federal government can make dog doo a legal currency?