Floydie...
thats why there will be flow restrictions. The guys at heathrow are receiving training for all you mention. A new tower - so what. New location - so what. A new computer - the engineers should have tested that to the nth degree. EFPS - perhaps the biggest issue, but should still be OK once the guys and gals get used to it, even though it is a big change.
There will always be misgivings about change, but not to the scaremongering that piece of toilet paper dramatically reports.