Ok, let's assume for a second that the Gestalt Rules are in force, and we're playing 3rd edition obviously.
Now, for a moment forget the Gestalt limitations on what a character can become, and assume that we are *modifying those rules* to suit our needs.
We have some characters that want to ultra-specialize in one thing. In effect, they want to be warrior/warriors or wizard/wizards. If the law of diminishing returns (thinks of Rolemaster ...) stops this, they want to be warrior/rangers or warrior/barbarians or wizard/sorcerers or wizard/psionicists.
We have some other characters that want to diversify. They want to be warrior/wizards, or cleric/rogues, or druid/monks, or psionicist/bards.
We have those who can't figure out whether they should specialize or diversify, and are trying to make up their minds.
And, we have those who are wondering if multiclassing *on top* of the Gestalt rules would be a good idea, either to specialize or diversify.
Some dream of being 'warrior/wizard / priest/rogues'.
Others dream of being specialized 'warrior/ranger / barbarian/monks'
And still others think they can pull off the super specialization of being 'warrior/warrior / warrior/warriors.'
Just how far do we let people go in either direction, towards diversifying or towards specialization?
If a gestalt character multiclassed into a quadruple class, he could theoretically (and legally!) be a: 'warrior/wizard / priest/rogue / bard/monk / psionicist/sorcerer'
Or, unbelievably (and ridiculously and illegally) specialized, he could be an 'abjurer/conjurer / invoker/enchanter / necromancer/diviner / transmuter/illusionist' or how about a 'warrior/warrior / warrior/warrior / warrior/warrior / warrior/warrior'
Talk about a mess. Obviously, we don't want someone who is every class, and certainly don't want someone who is a class 8 times. That is ridiculous.
But we do have many possibilities with multiclassing and gestalt.
How far do we go in allowing specialization or diversity? Where are the limits?