"Climate change will be a national emergency.
Homelessness will be a national emergency.
Poverty will be a national emergency.
College tuition will be a national emergency.
Name it and it will be a national emergency."
Most likely much of what you wrote is/will be true for the future.
And not just in the US.
On our southern border we are most likely getting only a taste of what can be expected in the years ahead.
Can the US just sit back and allow thousands of people every year to illegally come across the border into a sovereign country?
It's not too hard to believe things will worsen as more resources become strained and people become more desperate.
Law enforcement is not able to adequately deal with the border problem since...well...border patrol in the US doesn't shoot to kill like other countries that use walls to keep people in.
Like was pointed out, there are a list of things that will become more serious problems in the future.
Also, like it or not Trump delivered one of the things people who voted for him wanted and believe is necessary for America's safety and survival.
Don't hand me that crap about being anti-immigration or anti-Hispanic. That's a straw man and I'm getting weary of that line.
It's the lawlessness and brazen abuse and exploitation of America's system of government.
It's been fairly obvious to some people for a long time physical barriers are inevitable whether we like it or not.