1. alternative clients got relegated/segregated/split/forked off the network BEFORE any new network features changed, purely for the fact that they would not follow core. so pretend all you like that core happily invite alternative brands, but the truth is they dont.
this was not due to individual users going into their console/debug tab and manually deciding to disconnect opposition. it was not even really random users having coded clients that automated it to disconnect from the individuals peer list.
it was done by the core devs who have control over the main network resources such as Fibre/DNS where only a few nodes affect thousands of nodes.
2. running own alternative would be treated not as part of the main relay playingfield, but set as what core devs' themselves call the 'downstream'/'filtered' subfield of the network, the area that older/'compatible' nodes sit at, as a pretend 'part of the network' but do not get or relay at the same level.
3. if you think that coin hoarder have much say, or mining pools, or users. you would be wrong. core again proved it in august 2017.
pools had the threat that their blocks would not get passed matt corrallos Fibre fence to then reach majority nodes
client users had the threat their nodes wouldnt be in the DNS seeds of the main core devs listings
community had the threat that they would not be on a network which most exchanges/services accept
core devs did infact have 3 guns loaded in 2017 to get what they wanted and change a 35% consensus to their false 95%+
and if you think they will never try it again then you have become completely unaware of the last 4 years of rekt campaigns and threats used to get core where it is today.
and if any alternative even dared use the same 3 trigger tactic core did. then suddenly the alternative would be considered a trojan/attacker.. which is hypocritical.
the whole point of bitcoin/blockchain (solution to byzantine generals theory) is/was to find common unity of diverse mindsets to work together on a single decentralised playingfield. yet core have mutated that and the bitcoin of 2009-2013(15) is not the same as bitcoin 2015-2019