How do you propose to promote a top level sport without money? This is what pays, and therefore attracts, players.
For years now Test cricket has only really drawn crowds in England or Australia, and the breeding ground for those players on the county circuit is not financially viable. I suppose it might become so if the number of county sides playing the 4-day game was reduced just to the test match venue counties (goodbye, Yorkshire) and the standard of play less diluted, but even then....
....true aficionados like yourself are going to need to admit that a 5 day game does not appeal to a lot of people, even those who actually like cricket. I can't watch a 5 day match; I can't even watch a full day of a 5-day match. In all games, even the fondly remembered great ones, there are long, long spells when nothing at all is happening. Sometimes several days of play are lost to jockeying for position then everything happens in the last two hours and people congratulate themselves on what a great game it was.
One-sided encounters don't help, and is there anything worse than a side with a first innings lead of over 200 choosing to bat again? Where's the entertainment in that? That's 50, 60, 70 overs of utter tedium.
I'm sorry to say that Test match cricket is dying a slow death and should probably put out of its misery. The extended game is going to end up a relic played out to practically nobody with little publicity - like Speedway.