Yes, the polar icecaps are constantly expanding, collecting precipitation, flattening into ice, and moving outwards - the bits that break off around the periphery become icebergs. No, the supply of icebergs won’t run out unless the precipitation stops - and that will mean more problems than just a dearth in the iceberg supply!:eek:
And yes, theoretically, icebergs can be formed by any glacier anywhere in the world - except that, by definition, an “iceberg” is ice that fell off the glacier into the water. Most glaciers occur in steeply-pitched mountain ranges, and the runoff/meltwater doesn’t hang around, so the “icebergs” at the terminus are just hunks of ice that lay around on the ground and melt quietly away. Since they don’t drift, hide their bulk underwater, or sink passenger liners, they don’t get much attention, iceberg-wise.
In the waters off Newfoundland (where Titanic met its demise), the annual spring run of icebergs and “bergy bits” is currently underway. It’s been going on pretty much the same way ever since the last Ice Age ended, with no sign of diminishment, so rest easy on that concern.