It's good to see that you can see some of the forest for the trees as well. Just to play the game out a bit further... I want to add a comment or two about some of what you mentioned.
"Quickly" certainly isn't the word that jumps to my mind with anything related to the Main Street/Hub project. It's going on a year and a half and is still not finished. Leaving the topic of whether or not this project was a necessary evil off the table, let's make it simple and discuss the end result. In less time, Disneyland accomplished it's Main Street bypass and the end result doesn't have the issues that Florida is facing. The questions that a Disney Park fan should be asking is why that is continues to be acceptable? All the money that may be coming to Orlando to fix some of the woes of the resort won't mean anything if they are poorly implemented or maintained. The same attention to detail that goes into fixing DHS should be the same on replacing a water fountain or bypassing Main Street USA. The first and most important change that has to happen at WDW is a change of heart. The bottom line is that one US Disney Park is consistently hitting the mark and one is not. The One Disney initiative should mean the same practices and procedures; but, they fail at this even internally.
Adding capacity to Soarin' and DHS in many ways will compound the issues they are trying to solve - especially at DHS. Getting 1/3 more people through two headlining attractions faster means that those people are now in the pool of people in search of the next thing to do... and having more (meaning new/different) things to do is the real problems both parks are facing. Still, the extra throughput is a plus; but, will only payoff if/when additional attractions come online. TDO's heart is in the right place with this project... they've just got the timing all wrong.
I won't recap the Hub 2.0's "need" again; but, I will agree that the bypass part of it was needed. It's just the execution that is lacking.