I'd say it's a fairly often repeated statement, but is it a fact?
How do you measure it? By sales of new equipment? By Attendance? By the number of fields opening or closing? Through the number of stores?
Aye.
Whilst statistics need to be put in context, if you take a look at this link, it shows the search trends for the word 'paintball' in Google.
http://www.google.com/trends?q=paintball&ctab=0&geo=all&date=all&sort=0
Clicking on the USA link, from my understanding, the USA shows a 75% drop in the volume of the searches for 'paintball' since it's peak in 2003/2004.
Anyone can read into that whatever they want, but it's not a positive statistic and broadly reflects the sort of decline in market size that some of the manufacturers have anecdotally referred to in recent months. Also, some of the Big Game events in the US have seen a slump in player attendances, some down around 40% on a couple of years ago.
I've no doubt that some of it is due to the wider economic situation, but it would be myopic to just put it down to that.
Having said all that, as Vic Reeves once said, 98% of all statistic are made up.