I think that the blocksize limit of Bitcoin should stay the same. 1MB is good enough and it was put in to prevent spam and system failures. How can you be sure that if you raise the limit that these 2 things won't come back to bite you in the arse?
tl;dr NO!
We know blocks are mostly full. (there are some empty blocks that get mined immediately after a full block that bring down the average these blocks are empty because there is not enough time to include transactions.)
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average webpage is 2MB, In a distributed network like Bitcoin hosting a node that can accommodating 1 webpage every 20minits is not a viable justification to protect against spam. (in the almost 6 years since the limit was introduced technology has improved immensely so even if it was we should adjust it for technological gains)
Limiting the block size when it's full will limit the utility. The people who can interact directly with the blockchain will be limited to a number of users similar to today.
Future growth will happen on layer 2 services in exchanges and third party services who will charge fees. these service fees will bypass miners and as the Bitcoin security subsidy halves every 4 years we know miners will get less and less revenue.
While I am pro layer 2 services using bitcoin I am not pro limiting block size to make them viable. Limiting block size to artificiality create a demand for them is not what a responsible leader would do. Especially if the leader is actually developing layer 2 services.
We can be sure that 2 MB is a small insignificant increase that will limit bitcoin growth if the price doubled. We also have no conclusive evidence that the 1MB limit prevented spamming the network, now that the infrastructure around bitcoin has grown, bitcoin is not as susceptible to that type of attack. In fact that vector of attack vanished when miners started favoring transactions with fees. Today we have tools to refine what transactions are relayed and what transactions should be accepted, and miners can manage this with just a small fee to mitigate spam.
In 2010 Bitcoin had an inflation rate of 250% investors in bitcoin know that the inflation rate (the 50BTC) given to miners was a security subsidy in exchange miners processed transactions for free. back then the threat was someone would try and send infinite transactions for free and destroy the network. It never happened and the threat is now gone.
Today the inflation rate is just under 10% miners are still subsidize to process transactions (some miners cheat the system and mine empty blocks) but in general most transactions now pay a small fee to be included in a block despite all users subsidizing miners. It would be impossible to spam the network today because of the small fee. so we don't need to protect against it.