I really can't see Gerrard leaving Rangers unless Klopp was sacked at Liverpool. Although winning the Scottish title isn't normally seen as much of an achievement in England, breaking the one horse race monopoly is probably seen as significant.
Gerrard having proven he can compete has achieved what many thought improbable, with no premier league jobs likely to be offered a struggling club in the second tier Championship would be the slternative.
Lenny found out how finances and a downward spiral can make that switch brutal, you're not high profile anymore and noone really cares. You only make it if you have absolutely outstanding managerial ability, it's a constant battle against huge odds with one hand tied behind your back, it's not an attractive alternative.
Lenny sunk without trace at Bolton and Gerrard would bee e door!! a fool to leave imo.