What does "will" add to the meaning of this sentence? Does it actually add the meaning of future tense?
Much more could and should be said about this, but the foregoing will have to suffice for now.
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Using will have to implies that things are as they are out of necessity rather than choice. (Especially, in this case, because of the introductory could and should.)
In other words, the sentence could be rephrased as follows:
Much more could and should be said about this, but since we can't change anything right now, the foregoing is what we have to deal with at present.
Here, a (better) future situation is implied, but will is actually referring to forced events in the present—as determined by the use of for now.