I think what they're getting at is that teams have folded and the league has shrunk before. Much more rarely than expanded, but it happens.
Sure, but we're talking overall trajectory here.
The NHL has shrunk twice and expanded 8 or 9 times now. MLS contracted teams in the pasts, but are adding left and right.
MLB went from 25 teams to 12 in the 1890s, but has grown from 16 to 30 over the last 100 years. NFL has grown. NBA has grown.
The sports world expands constantly and shrinks rarely.
This is why I want the NHL to adopt a 3-division alignment for the Western Conference upon Seattle's admission but keeping the 2-division alignment in the East. The Central Time teams would make up a smaller Central Division, The five northernmost Mountain and Pacific Time teams would form the Northwest Division, and the five southernmost Mountain and Pacific teams would form the Pacific Division.
The alternative, putting Arizona in the Central, is sure to result in complaints from the Central Time teams, because during parts of the season, Phoenix is effectively on Pacific Time due to the fact that most of Arizona does not observe DST. Thus, during these parts of the season, a Central Time team coming home from a road game in Phoenix would lose 2 hours. This was the kind of situation the NHL eliminated in 2013. But the NHL's decisions to put 2 more teams in the Pacific Time Zone rather than the Central has complicated things (logically, #31 and #32 should have gone to Houston and Kansas City, which would move Colorado to the Pacific).
Under my proposed alignment, teams would play every non-division foe twice, and between 28-34 division games (4-7 per opponent) depending on the size of the division.
Well, whole other kettle of fish, but the problems you see there could be easily avoided and create better inventory if they simply abolished the pure geographic alignment structure, accept that the league is simply too big to play everyone home/away, and make a structure that maximizes both TV times and quality inventory.
Like:
Wales: Smythe 4, Norris 4, Adams 4, Patrick 4
Campbell: Smythe 4, Norris 4, Adams 4, Patrick 4
> Only play games against 5 of the 8 divisions or 6 of the 8 divisions.
Or
Wales: Smythe 8, Patrick 8
Campbell: Norris 8, Adams 8
> 6 vs division (42), 3 vs conference (24), 1 vs non-conference (16).
By making the alignment/schedule based on geographic groups, you have to have a symmetrical allotment of teams and we don't. The NHL is configured as if we have 8 Pacific/8 Central in the West, 16 in the East and the line is between Nashville and Detroit.
The line of East/West is really in Nebraska. We really have 10 West teams and 22 East teams. That's why alignments always suck for a group of teams.