You're all correct, I think .... parking needs to be encouraged in order to facilitate footfall to the high street ... Speaking as someone who does own a small, independent shop on our local high street, the key thing that is needed is money to enable people to open up a shop in the first place, and enough of it to enable them to keep going through the first couple of rocky years.
It costs an absolute fortune to run even a small shop these days. The cost of employing staff is high (and rightly so). Opening for longer hours means you either do it yourself and therefore run yourself into the ground and don't see enough of your own family, or pay someone else and your costs go up. It's a really fragile balancing act.
Added to that, my shop has been in its current location for THREE YEARS now and people STILL walk in and say "ooh I didn't know you were here" .... sigh.... despite the massive signage outside, our huge social media presence, website, advertising in local magazines etc etc ....
It's really bloody tough. The internet is the main culprit imo, certainly with regard to what I sell (clothing). Too much competition online, too many choices. In the seven years since I've opened my business I have had to constantly change / evolve in order to survive. I'm at the point now where I am so exhausted that I am taking a step back and gradually moving towards doing something else.
On our high street, new coffee bars, restaurants and pubs seem to do very well. Other independent businesses struggle.
Our big town centre, a couple of miles away, is half dead now. Half the units are empty. Debenhams closing; M&S, Dorothy Perkins, Miss Selfridge, Next etc all gone, moved to the big out-of-town shopping mall a few miles away, which has thousands of free parking spaces, is on all the major bus routes, is totally soulless and only has one independent place which is an amazing cafe ... and which manages to survive, probably largely due to DD and me who are addicted to their burgers and hot chocolate.
It would be very hard for Etsy-type shared spaces to survive in most high streets due to the high rents and business rates etc. Even if sharing space, you'd still be responsible for some of the costs, and these can be sky-high. Also, there often isn't a lot of profit int things, and you'd need to sell thousands of units in order to make money. People don't understand that something handmade will cost more than something made on a production line, due to the time involved. I'm not saying that shared spaces don't work in some locations, but there are a few of them in our area - I know many traders who've participated in them and not one of them has lasted more than a year as they simply didn't make enough money.