Why Don't the Palestinians Just Move?

One could ask, why don't the Palestinians in Gaza just move?  After all, it would seem, they should be able to move form the part of the country being attacked to another part of the country.
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But here Geography raises it's nasty head.
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Gaza is tiny.
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Gaza is 1/2 the size of the cities of Charlotte or Austin (both ~ 290 sq. miles city PROPER, not suburbs).  Gaza is small.  Additionally it is dense.  How dense?  Well, the area is the 6 most densely populated area int eh world (after Macau, Monaco, Singapore, Hong Kong and Gibraltar).
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It has 1/2 as much land as Charlotte NC or Austin TX, but twice as many people (1.4 Million vs. ~ 700 thousand for those cities proper).
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Gaza is a tiny bit less densely populated than the city of Chicago.

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So the answer, "Why don't Palestinians Just Move?" Is that there is no where to go.  Israel and Egypt won't let them leave and, even if they did, almost no country will accept economic refugees anymore.