I think it was 'Buller' who brought them into the conversation(?), but anyhow, Distillery are no more "irrelevant" than a club like Monaghan Utd or Cabinteeley, except that if ever they have a revival in fortune, they still have a clear route back to Senior status.
While for information, for the last five seasons in the top tier (to 2012/13), they still managed crowds of c.400 at Ballyskeagh, and that at a time when the divisional average was not much more than 800, itself half the figure today (c.1,600).
Institute's ground at Drumahoe was very tidy - 3k capacity with half of those seated - I'd say better than many in the LOI FD, maybe even one or two in the PD? The ground was then completely flooded out after the 2017/18 season started, so they moved into a nearby municipal ground as an emergency measure. At the end of that season they moved to the Brandywell, while they tried to sort out Drumahoe.
Unfortunately they couldn't get Planning Permission from the Council to install flood barriers, since that would just have transferred the problem further downstream to a more populated area. And even if they could, the flood brought in Japanese knotweed, meaning they could never get insurance.
However they've now got the go-ahead to build a ground as the centrepiece of a new sports hub in the Waterside:
https://www.derryjournal.com/sport/f...erside-4019517
In which context Stute are another interesting case. For the first 90-odd years of their existence they were a Junior team, albeit one of the more prominent ones. Then when DCFC moved to the LOI, they saw an opportunity to achieve first Intermediate status, then Senior. Some of this predated the present IL pyramid, but there's no doubt it has been assisted greatly on its way by the new structure.
And seeing as they were attracting 4-500 a decade ago, when crowds generally were v.low, there's no reason why, in the new stadium and with good management, they couldn't aspire to crowds approaching four figures if they got to the IL Prem, which should be enough to sustain p-t professional football. Which imo wouldn't be too shabby, considering they're very much the second team in a city of fewer than 100k.
Expansion?
Comparing (Greater) Dublin with Belfast, there's no good reason why the former couldn't sustain another Senior club or two at the level of some of the existing ones. While Cork is much bigger than Derry for instance, yet unlike Derry, I'm not sure it's ever had more than one Senior club?
Unless footballing people in ROI are happy to carry on with the same 18 or 20 Senior clubs, with only a yawning chasm below?