Total rubbish! Not even close.
Half of LA would mean over 2,000,000 people moved from LA to Vegas. So how does this work when Vegas only has a population of about 600K?
Vegas metro area population 2017 2,204,079)
Ya want to continue your reckless gibberish? Ya want to include the metro areas? OK. LA county has nearly 11 million..Half of LA city would be 2 million. With the greater LA area, that's about 13 million total. Half of that would be nearly 7 million.
So tell me, if half of LA and or the LA metro area was included, how is it possible 7 million moved to Vegas from LA when the entire population in the entire Vegas area is only about 3 million?
How exactly does that work?
The population of Clark County is 2.2 million. Most of what people think of as Vegas is in the County. ie the strip is all County.
https://www.census.gov/quickfacts/fact/table/clarkcountynevada/PST045217