I think we should look at Honda troubles as troubling for F1 as a whole. We need to look at the facts.
1: In 2010 3 teams entered F1 (LotusF1, Virgin Racing and Hispania) as of 2017 all of those teams are out of F1.
2: Honda re-entered F1 in 2015 as PU supplier and 3 years later they stil have not achieved reasonable performance.
F1 rules are therefore insufficient for new entrants. I don't know why the F1 fraternity lets this even happen. F1 needs manufacturers to successful in order to attract more new entrants. However, F1 lets Honda struggle for 3 years. Its just stupid and robs F1 fans of a team of the caliber of McLaren to be not competitive. This is situation were there are no winners.....
Let Honda and future new entrants to F1 test more in order to catch-up and make it more easier for new entrants to be competitive. I don't like artificial tricks like weight penalty ectera. But, give new teams or PU manufactures a 12 month testing period. Japanese companies have a lot of pride, I don't see Honda in F1 in 2018 if 2017 is as horrible as 2015. They will simply pull to plug and focus maybe on Formula E or WEC.