It is the proliferation of Akhand paths, Sukhmani paths and other programmes for birthdays that has exacerbated this. People start to serve guests like at home rather than serving the sangat. 

People will just go to a different Gurdwara.

Yep some people treat langar hall like a soup kitchen. If they just served Dal That would deter people who think Gurdwara is some kind of canteen for free food. Also langar should be plain. Not fancy. Ie so many dishes and sweets. Ect.  One improvement I have seen is we now have a leaflets area in Gurdwaras for people to learn. 

the dumalla was much smaller in times of Guru Gobind Singh, it may be mistaken for a hat in these days!

the same shanka was shown by sikhs towards Guru Hargobind Sahib jee when they started wearing dumalla, carrying shastar, hunting shikaar and being surrounded by warriors. sikhs went to complain to Baba Budha jee and Bhai Gurdas jee. Also a parallel gurgaddi was started to try and imitate the first 5 Guru Sahibs and oppose Guru Hargobind ji warrior lifestyle. I'm seeing the same shanka now. Especially towards really rehitee Singhs such as Budha Dal, Tarna Dal, Hajoor Sahib and Patna Sahib.  Most Singhs that keep the vegeterianism do not follow rehit in any full form, especially towards the warrior/kshatriya style and also fall flat of preserving Guru Gobind Singh bani, many cannot even read Chaupai Sahib properly! If the veggie Singhs followed rehit sangat could take them seriously, unfortunately they do not especially as they are led by jathebandis and sant babas that have no interest in following rehit fully like the 2 takhts and the Dals do preserve rehit! Do not use your vegeterianism as an excuse to not follow rehit and wear bana and actually follow all 10 Gurus, but this is what has been happening since last century!