I believe the CBO is talking about the very short term. . .like, it wouldn't fix the deficit THIS YEAR no matter how high the taxes would go up THIS YEAR.
If the taxes on the top 2% were raised UNTIL the deficit was resolved to a level that would be acceptable (let's say, 39% to 45%, for a period of 10 or 15 years), WHILE, at the same time, the entitlement budget was controlled to go down every year by let's say 5%, I believe their assessment would be very different.
If you have data showing differently, I'd love to see it.
These are some bold assumptions you are making. 5% cuts in entitlement programs every year is unlikely...those programs are only growing. And "acceptable" can mean very different things to different people.
That said, you also comment that the deficit would just be brought to a level that was acceptable. The presence of the deficit suggests that the budget would still remain unbalanced.