There are numerous campaigns, laws, and proposed bills, but none are insisting on real parity as this means BSL gets relegated to second language status not first. English is the language area they have to work in. The campaigner views it as discrimination, but that is not necessarily the grassroots view, as increasing evidence shows young deaf are more included have more access and rights and are not opposing the means to attain a level playing field to pacify activism, they know that they need to learn how to communicate and relate to the hearing world not attend mainstream as spectators. They want what hearing want, but that requires compromise not campaigns.
The poster reiterates the same distorted messages and alarms we can read in many places on the deaf internet. Ergo You will lose your friends and social circle, be forced to hear (!), and be isolated unless you adopt some 'back to the future approach to education that never worked academically for deaf people, neither will a BSL-driven system work, because that is a deaf social tool, not an academic grounding to work in a non-deaf world.
The poster attacks SSE which is really what deaf should be using as this closely relates to what hearing people are using so making communication easier. If deaf want to sign BSL socially that is fine, but it is not a viable tool to work within the mainstream. The support costs can be astronomical and unnecessary, had they attained English grammar education and knowledge day one. There is basic view deaf want deaf so the rest doesn't come into it, they would not be saying that had the state not empowered that ignorance because they view deaf severely disabled too. There still seems considerable confusion with deaf people who claim non-disabled status but rely on its fiance and support to exist, even for its culture to exist.
The disability sector, however, accepts support for access, and inclusion, not cultural reasons. There is no disability culture. As regards to mentors, they are such as role models only because they have made it in a deaf world and can easily communicate with other deaf, but not a hearing one mostly. So they won't be role models in that they can empower other deaf to break the BSL mould and move outwards. Their function basically, is to empower and promote culture, not an ability to work properly by showing the example.
Idealism has overtaken realism and practicality and is fuelled with dire warnings, and a blame culture, this is not the way forward for deaf people. To demand hearing sign and no attempt to go halfway by deaf is doomed to failure as is evident everywhere. Various rights campaign tend to aim at reinforcing and making deaf isolation more comfortable and acceptable, rather than any aim to move forwards or outward.
You can have a different culture and language, e.g. many migrants have these, but they also know this is the UK and they have to adapt, there is no reason the deaf cannot do likewise, after all, they can do everything except hear.... can't they?