Not likely - and Honda is nowhere in the ballpark of 100,000 units. Search the forum (or google) a bit and you can find a bunch of articles with the approximate numbers for the various auto makers.
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If you are buying (rather than leasing) then the credit phase out is based on the number of eligible vehicles sold by a particular manufacturer -- and Honda is nowhere close to that number. So you should be good to go on that part of the credit for a couple years, at least.
It's possible that Congress will change the law to eliminate the tax credit sooner. They tried to do that last year as part of the budget deal, but it was defeated in the Senate. There is nothing on the agenda right now that would cause that to happen, but with the current political situation, you never know.
If you are leasing, rather than buying, then it's up to the leasing company how much (if any) of the credit to pass on to the lessee. That could change at any time.
Does that all make sense?
One thing to keep in mind is that the credit is just that: a tax credit, not a rebate. It's non-refundable, meaning that a) you will need to wait until you file your taxes before you can claim the credit, and b) you must have a tax liability of at least $7,500 to get the full benefit. Note that that's your total tax liability, not how much you send to the government on Tax Day. That is, if you have taxes taken out of your payroll, you might be seeing that money come back when you file.