If the club and LCC collective minds are made up on Stonebridge then realistically that's where it will be or stay at undeveloped GP. I would love the waterfront over a draery industrial zone but it will come down to hard talking about time and money.
As regards all the posts about parking and public transport problems, back to Dublin examples....
Croke Park regularly holds crowds of 83,000 in middle of north inner city with damn all car parking or public transport within a mile of the ground. There is one rail station close to CP that only serves one line to the west. Stations for south, south west south east or north of the country from where thousands regularly come, are a distance away..
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People park in the centre or outskirts and walk. Same with regards to buses, tram and light rail. There are police cordons all around the stadium within 500 yards so with few exceptions (Clonliffe College has parking for a few hundred cars at a fee) everyone else walks from the city centre area or other areas within 20-30 minutes of Croker having either parked, got a tram or rail; inter city train stations are even further away.
I live in Kilkenny (90 miles) and I park in city centre then a twenty minute walk will have me at the ground.
The only public transport that goes right to the Aviva is the DART (light rail). Again, most car parking and buses are at least 20-30 minutes walk away.
The Three Arena is within a couple of stops of the Aviva - it is just across the river - but I don't see any issue with Three screaming foul if there is a major fixture in Aviva at the same time as a major concert. There will be enough fans for both events provided the attraction is good. Anyway tickets for concerts etc go on sale months in advance.
The issue here is how much and when. If we mess this up as a club again....I give up ever seeing Everton in a fit for 21st century stadium - I absolutely love Goodison but am realistic.