I'd rather talk about the years between 2004 and 2014. For countries like Poland you cannot blame only the diaspora for their good televoting results. It surely helps, but it's not the main reason. And even if you cannot find many fans of it in the internet, it doesn't say anything. Not everyone who votes in Eurovision is active in these forums and so on. They are rather dominated by the youth, but many elder people vote as well.
And even the big countries like Greece, Azerbaijan, Turkey or Ukraine cannot only relate to diaspora, as some of their results prove. You can say that it's still unfair they always qualify, or almost at least, but that's not the important thing in Eurovision. The "small" countries can qualify with strong songs anyway. I mentioned them often enough, but for those who forgot just some once again (CZ 2015, CH 2012-2014, BG 2012-2013). And the winner will be the favourite of the majority no matter what country it comes from (DE 2010, AT 2014 In front of the Netherlands in case you forgot)
Once again, of course Russia, Greece, Azerbaijan and co have a big advantage towards others, but to second that, they're doing everything to get the satisfying results in most years, going rather for mainstream stuff.
In the end, every country can get the good results, they do not need the juries. And since the juries, we get more and more songs in english, more and more ballads and more boring heterogenous results in the finals, especially in the televoting section, because three or four qualifiers each year are no televoting qualifiers and cannot stand a chance to sneak into some Top 10's.
This is exactly same as if I wrote it. Well done