@Libertine Seguros
All your examples are dependent on regulations with respect to cars etc. Different rulesets make developing cars which adhere to differing ones difficult. Then a 'breakaway' that evolves differently is difficult.
Cycling is not about the most optimal bike. ASO does not make the regulations, the UCI does. A new league would not differ so any team can just compete in both, just like they now compete in the Giro and the Tour.
Without the Tour I think it's still beneficial. There used to be the 'UCI Road World Cup' and the new league can create something similar. Spread out events with a winner at the end. Exact setup to be determined but effectively points per race and you can scratch some results (or best x results count). You avoid July and you have the chance of attractive fields throughout a season for the organisers that join (like Flanders). You sell it as one package and I'd expect sponsorship of the events as well as TV package to be worth more than now individually. Especially with calling whoeever wins it the best cyclist of the season, rather than the ridiculous voting now. You leave a standing invitation for the Tour to join and keep blaming the French for not working in unison. It would create a more cohesive calender and more to look at through the year as its actually interconnected throughout, instead of all loose events.
I now see (thank you Google/Wiki:
https://en.wikipedia.org/wiki/UCI_Road_World_Cup ) that TDF was never part of the UCI Road World Cup but also that events still were sold separately. So it's something with legacy but in a renewed package which might attract more money to the sport. Also something that might entice people besides the TDF.
@kingjr
Held back; that everything is individually organised (well, mostly) and that supposedly people only care about the TDF and will only care about the TDF. Except for the 'die-hard' fans. Thinking like that makes it a self-fulfulling prophecy. Cycling is entertaining, it's amazing but it's not marketed well. Most people just associate it with doping and maybe the TDF (or combination thereof). While there are many events on the calendar that are amazing. Broadcasting of it can also be improved a lot and there are ways of bringing people closer to the riders and their achievements. Netflix documentary helped (but was only about the tour), many teams had their own documentaries but those are quite small scale but we can also think outside the box: think of publishing the power data and you can ride with the riders on the same route virtually (most people will need some help then though ;-) ). When Vingegaard goes you can stay in his wheel (assuming your power to weight gets a 50% boost!) while sweating your arse off.
Anyway, I took a detour: An attractive set of races, throughout the year, combined together with an additional competition whereby broadcast rights are sold as a package and investments are made in the broadcast/marketing around (like another Netflix docu although that's copying a bit) would, I believe, attract a larger audience than they now do individually.