That's not really what he is saying, not getting promotion in the first year doesn't mean someone may walk away. However not being able to get promotion for 4 years, or even 5 or 6 possibly, isn't a particularly appealing proposition.
We need investors full stop and make things much too difficult by putting obstacles in their way. Its only in Rugby League that fans seemingly require a purity test for everything an owner does, whether that is not being allowed to buy success or castigating new clubs for not having a squad full of players born with 5 miles of the ground. With the salary cap and its exemptions one approach is allowed, an approach which is heavily skewed and weighted towards the existing status quo and especially the big clubs, and that's it. Other sports don't look at things that way and welcome money being invested. In RL its usually just fear of their own particular club being overtaken or relegated that leads some RL fans to think like that.